News Feed
Sections




News Archive
Looking for more information on how to do PHP the right way? Check out PHP: The Right Way

Travis Swicegood's Blog:
Why Inheritance Sucks
October 12, 2007 @ 10:11:00

Travis Swicegood has made two blog posts about his agreement with other statements made about why class inheritance sucks.

From the original comments made by Bernard Sumption:

All of the pain caused by inheritance can be traced back to the fact that inheritance forces 'is-a' rather than 'has-a' relationships. If class R2Unit extends Droid, then a R2Unit is-a Droid. If class Jedi contains an instance variable of type Lightsabre, then a Jedi has-a Lightsabre.

Travis agrees and then comes back with his second post to clarify something - composition versus inheritance:

I approach OOP from a flexibility standpoint with one of its biggest flex-points being loose coupling which in turn promotes reusability. I'm going to use Event as a hypothetical example.

He uses Events and design pattern illustrations (like the Visitor and Observer) to help illustrate his point.

0 comments voice your opinion now!
inheritance designpattern observer event composition confusion inheritance designpattern observer event composition confusion


blog comments powered by Disqus

Similar Posts

Ivo Jansch's Blog: Mixins in PHP

Bence Eros' Blog: Using Inheritance

Label Media Blog: Design Patterns in PHP - Factory method

DevShed: Introducing Mediator Classes in PHP 5

PHPEasy.co.uk: Design Patterns - The Singleton Pattern


Community Events

Don't see your event here?
Let us know!


introduction conference extension release version performance php7 interview series podcast library opinion xdebug symfony2 voicesoftheelephpant community laravel example framework api

All content copyright, 2015 PHPDeveloper.org :: info@phpdeveloper.org - Powered by the Solar PHP Framework